Potassium nitrite
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Potassium nitrite (distinct from potassium nitrate) is the inorganic compound with the chemical formula KNO2. It is an ionic salt of potassium ions K+ and nitrite ions NO2−, which forms a white or slightly yellow, hygroscopic crystalline powder that is soluble in water.[1]
Quick Facts Identifiers, Properties ...
Identifiers | |
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3D model (JSmol) |
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ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.028.939 |
EC Number |
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E number | E249 (preservatives) |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 1488 |
CompTox Dashboard (EPA) |
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Properties | |
KNO2 | |
Molar mass | 85.10379 g/mol |
Appearance | white or slight yellow solid deliquescent |
Density | 1.914986 g/cm3 |
Melting point | 440.02 °C (824.04 °F; 713.17 K) (decomposes) |
Boiling point | 537 °C (999 °F; 810 K) (explodes) |
281 g/100 mL (0 °C) 312 g/100 mL (25 °C) 413 g/100 mL (100 °C) | |
Solubility | soluble in alcohol, ammonia |
−23.3·10−6 cm3/mol | |
Thermochemistry | |
Heat capacity (C) |
107.4 J/mol K |
Std enthalpy of formation (ΔfH⦵298) |
-369.8 kJ/mol |
Hazards | |
GHS labelling: | |
Danger | |
H272, H301, H400 | |
P210, P220, P221, P264, P270, P273, P280, P301+P310, P321, P330, P370+P378, P391, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
235 mg/kg |
Safety data sheet (SDS) | External MSDS |
Related compounds | |
Other anions |
Potassium nitrate |
Other cations |
Sodium nitrite |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It is a strong oxidizer and may accelerate the combustion of other materials. Like other nitrite salts such as sodium nitrite, potassium nitrite is toxic if swallowed, and laboratory tests suggest that it may be mutagenic or teratogenic. Gloves and safety glasses are usually used when handling potassium nitrite.